Yeah, I once managed to foolishly induce this while taking too much aspirin over a too long period to deal with tooth pain. I'll never forget the sensation: out of nowhere it sounded like someone was crinkling paper inside my head for about a second, and then quite loud and constant tinnitus with regular sounds becoming muffled. Was quite frightening.

It thankfully went away after a day or so after I (immediately) stopped and I don't seem to have suffered any permanent damage that I know of, but it taught me to not fuck around with NSAIDs.